Sanding drum



De- 9, 1941- G. w. STAHL 2,265,581

SANDING DRUM Filed May 14, 1941 2 Sheets-Sheet l By @Mm Attorney /a l.gl m lll l rrj:

ci L- p r3 C-'j 4 X P1- "n 7 Inventor Dec. 9, 194.1. v G. w. STAHL2,265,581

SANDING DRUM Filed May 14, 1941 2 Sheets-Sheet 2 In ventor Wm; WJfQ/f/By l Attorney Patented Dec. 9, 1941 UNITE D STATE S PATENT OFF]2,265,581

SANDING DRUM Glenn W. Stahl, Warre'ns'burg, Mo.

ApplicationMay 14, 1941, Serial No. 393,467

(C1. l51e-194i 3 Claims.

This invention relates to sanding drums, and more particularly to thesecuring of 'abrasive material thereon, and has for the primary objectthe provision of a securing device for the .purpose specified which willpermit easy and vquick application of abrasive, in sheet formation, ontothe periphery of the drum and Which is actuated or caused to grip andretain the abrasive sheet by centrifugal action during the rotation ofthe drum, obviating the danger of the abrasive sheet accidentallydetachin'g from the drum during the use of the latter and which willpermit easy removal of the abrasive sheet from the drum Whenever needmay occur to substitute another sheet therefor.

With these and other objects in view as will become more apparent as thedescription proceeds, the invention consists in certain novel featuresof construction, combination and arrangement of parts which will b-ehereinafter more fully described and claimed.

For a complete understanding of my invention, reference is to be had tothe following description and accompanying drawings, in which Figure lis an end elevation, partly in section, illustrating a sanding drumequipped with a securing means constructed in accordance with myinvention.

Figure 2 is a plan view illustrating a drum with a throat or slot in theperiphery thereof to permit the engaging of the ends of an abrasivesheet with the securing means.

Figure 3 is a sectional view taken on the line 3--3 of Figure 1.

Figure 4 is a perspective View illustrating the securing device orelement.

Figure 5 is a perspective view illustrating one of the end plates of thedrum.

Referring in detail to the drawings, the numeral 5 indicates a drumhaving an axial bore in which is secured a shaft 6 for the rotation ofthe drum. One end of the drum is covered by a removable plate I held inposition by fasteners 8. The other end of the drum is covered by aremovable plate 9 held in position by fasteners I0 and provided with anopening II to permit the shaft 6 to extend therethrough.

Formed in the drinn eccentrically of the bore is a chamber I2 to receivea pivotal securing device or element I3. The chamber I2 is soconstructed as to provide converging walls I4 and a substantiallycylindrical shaped portion I5. 'I'he drum 5 is further provided with athroat IB in the form of a slot formed in the periphery of the drum andextending the full length of the latter. The throat 'connects lwith thechamber I-2,1as 'clear/ly shown in Figure l.

The securing device I3 is in Lthe form 'of -a plate 'I'I having opposite`converging walls and a substantially'cylindrical portion I8. Thecylin-l drical portion I8 is journaled in the cylindrical portion of thechamber I2 and the Aplate II of the securing Vdevice has a limited.pivotal movement Ibetween the converging walls vof the cham ber.

A rib I9 is formed on one of the converging walls of the plate I'Iadjacent the free end of the latter.

The periphery of the drum has a covering 20 constructed of leather,rubber or any other material suitable for the purpose to provide acushion seat for a sheet of abrasive material 2I. The covering has aslot to match the throat I6 so that the ends of the sheet of abrasivematerial may be inserted into the chamber by Way of the throat to permitthe ends of the sheet of abrasive material to be confined between oneWall of the chamber I2 and one of the faces of the plate I'I.

It is preferable that the ends of the sheet of abrasive material havetight fit with the wall of the chamber and with one face of the plateI'I of the securing device. Further, it will be seen that the rib I9also bears against one of the end portions of the sheet of abrasivematerial.

When the drum is in operation, it rotates in the direction indicated bythe arrow in Figure 1 and due to centrifugal action the securing deviceI3 is forced in the direction of one of the walls of the chamber I2forcing the ends of the sheet of abrasive material against saidlatter-named wall and thereby firmly anchoring the sheet of abrasivematerial on the periphery of the drum, which With the covering Willprevent the sheet of abrasive material from creeping on the drum.

From the foregoing, taken in connection with the accompanying drawings,it will be seen that a very simple securing device has been provided forsecuring the ends of an abrasive sheet in a chamber provided in a drumso that the abrasive sheet may extend entirely about the periphery ofthe drum from end to end of the latter and Will be prevented fromcreeping or becoming accidentally detached during the use of the drum.Still the device constructed in accordance With the foregoing willpermit the easy removal of the abrasive sheet Whenever need may occurWithout removing separable fasteners and equivalent securing devices.

While I have shown and described the preferred embodiment of myinvention, it will be ing Walls and a cylindrical portion, a fastening"device including a plate having converging Walls arranged opposite theconverging ywalls of the chamber and a cylindrical portion journaledwithin the cylindrical portion of the chamber, said plate coacting withone of the converging walls of the chamber in grippingends of anabrasive sheet inserted in the chamber by way of the throat bycentrifugal action during the rotation 'of the drum, and a rib formed onthe plate adjacent its free end and on one of the converging faces tocontact the abrasive sheet.

3. In a device of the charactendescribed, a

drum having an eccentrically located chamber to its axis of rotation andprovided with a throat in the periphery thereof communicating with saidY chamber, said chamber including converging Walls and a cylindricalportion, a fastening device vincluding a plate having converging wallschamber and a cylindrical portion journaled within the cylindricalportion ofthe chamber,y said plate coacting With one of the converging-Walls of the chamber in gripping ends ofv an abrasive sheet inserted inthe chamber by Way of the throat by Ycentrifugal actionjduring therotation of the drum. Y

L `2. In` a device of the character described, a drum having anveccentrically located chamber to itsfaxis of rotation and provided witha throat inthe .periphery thereof communicating with said chamber, saidchamber including converging Walls and a cylindrical portion, afastening de-A vice including a plate having converging Walls arrangedvopposite the converging Walls of the arranged opposite the convergingWalls of the "chamber and a cylindrical portion journaled within thecylindrical portion of the chamber, said plate coacting With one of theconverging walls of the chamber in gripping Yends yof an abrasive sheetinserted in the chamber by Way-oft the throat by centrifugal actionduring the ro tation of the drum, afrib formed onthe plate adjacent itsfree end and on o-ne ofthe converging faces to contact theabrasivesheet, and a cover for the peripheryof the drum and having its endsspaced at the throat andV forming av cushionv seat for the abrasivesheet on the p'eriphery of the drum. f

GLENN,V W. STAHL. Y

